1. Germination of the spores of Marattia sambucina and Macroglossum smithii results first in a plate and then in a mass. The gametophytes are dark green from the very first, but the old gametophytes may show a pale tissue in the midrib-which may contain a large amount of starch. The rhizoids of both species are colorless; multicellular rhizoids are produced occasionally by Marattia sambucina. 2. The antheridia show wide range in size, from those on regenerated branches which may show 15-30 sperms in median section to those on vigorous gametophytes 1-4 years old which may show 140-170 sperms. 3. The archegonium of both species is short and broad, projecting but slightly beyond the surface. The two nuclei of the neck canal are usually not separated by a wall, but occasionally a wall is formed. The ventral canal cell is large. The jacket layer consists of a few tabular cells which are slow in developing and not highly differentiated before fertilization. 4. Apogamy, shown in the development of tracheids, was...